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<table width="100%" summary="page for sole"><tr><td>sole</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Sole Eggs in the Bristol Channel</h2>

<h3>Description</h3>

<p> Data on Sole Egg densities in the Bristol Channel (West Coast of
England, UK.) The data are from 5 research cruises undertaken for the purpose
of measuring Sole egg densities. Samples were taken at each of a number of
sampling stations, by hauling a net vertically through the water column. Sole
eggs were counted and assigned to one of four developmental stages.  
</p>


<h3>Usage</h3>

<pre>
data(sole)
</pre>


<h3>Format</h3>

<p>A data frame with 7 columns and 1575 rows. The columns are:
</p>

<dl>
<dt>la</dt><dd><p>latitude of sampling station</p>
</dd>
<dt>lo</dt><dd><p>longitude of sampling station</p>
</dd>
<dt>t</dt><dd><p>time of sampling station: actually time of midpoint of the cruise on
which this sample was taken. Measured in Julian days (days since January 1st).</p>
</dd>
<dt>eggs</dt><dd><p>egg density per square metre of sea surface.</p>
</dd>
<dt>stage</dt><dd><p>to which of 4 stages the sample relates.</p>
</dd>
<dt>a.0</dt><dd><p>lower age limit for the stage (i.e. age of youngest possible egg in
this sample).</p>
</dd>
<dt>a.1</dt><dd><p>upper age limit of this stage (i.e. age of oldest possible egg in sample).</p>
</dd>
</dl>


<h3>Source</h3>

 
<p>Dixon (2003)
</p>


<h3>References</h3>

<p>Dixon, C.E. (2003) Multi-dimensional modelling of physiologically and
temporally structured populations. PhD thesis. University of St Andrews
</p>
<p>Horwood, J. (1993) The Bristol Channel Sole (solea solea (L.)): A fisheries
case study. Advances in Marine Biology 29, 215-367
</p>
<p>Horwood, J. and M. Greer Walker (1990) Determinacy of fecundity in Sole (solea
solea) from the Bristol Channel. Journal of the Marine Biology Association of
the United Kingdom. 70, 803-813.
</p>
<p>Wood (2006, 2017) Generalized Additive Models: An Introduction with R. CRC
</p>


<h3>Examples</h3>

<pre>
  require(gamair)
  data(sole);data(coast)
  par(mfrow=c(2,3))
  sample.t &lt;- unique(sole$t)
  stage &lt;- 1
  for (i in 1:5)
  { egg&lt;-sole[sole$stage==stage&amp;sole$t==sample.t[i],] 
    plot(egg$lo,egg$la,xlab="lo",ylab="la",main=paste("day",sample.t[i]),cex=egg$eggs/4,
    xlim=range(sole$lo),ylim=range(sole$la),cex.axis=1.5,cex.lab=1.5,cex.main=1.5)
    points(egg$lo,egg$la,pch=".",col=2)
    lines(coast)
  }
  ## boundary definition list and knots suitable for soap film smoothing
  bnd &lt;- list(list(lo=c(-6.74,-5.72,-5.7 ,-5.52,-5.37,-5.21,-5.09,-5.02,
          -4.92,-4.76,-4.64,-4.56,-4.53,-4.3,-4.16,-3.8 ,-3.8,-5.04,-6.76,
	  -6.74),
          la=c(50.01,50.02,50.13,50.21,50.24,50.32,50.41,50.54,50.59,50.64,
	  50.74,50.86,51.01,51  ,51.2,51.22,51.61,51.7,51.7,50.01)))

  knt &lt;- list(lo=c(-4.643,-5.172,-5.638,-6.159,-6.665,-6.158,-5.656,-5.149,
  -4.652,-4.154,-3.901,-4.146,-4.381,-4.9,-5.149,-5.37,-5.866,-6.36,-6.635,
  -6.12,-5.626,-5.117,-4.622,-4.695,-4.875,-5.102,-5.609,-5.652,-5.141,
  -5.354,-5.843,-6.35,-6.628,-6.127,-5.63,-5.154,-5.356,-5.652,-5.853,
  -6.123),
   la=c(51.626,51.61,51.639,51.638,51.376,51.377,51.373,51.374,51.374,
   51.376,51.379,51.226,51.129,51.194,51.083,51.147,51.129,51.151,50.901,
   50.891,50.959,50.958,50.942,50.728,50.676,50.818,50.825,50.684,50.693,
   50.568,50.564,50.626,50.397,50.451,50.443,50.457,50.325,50.193,50.322,
   50.177))

   points(knt$lo,knt$la,pch=19,col=2,cex=.6)
   lines(bnd[[1]]$lo,bnd[[1]]$la,col=2)
</pre>


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